Maintained by: DC GISOwner: DouglasCountyCO_GISServicesSource: National Geodetic SurveyEdit Frequency: NoneSummary: Data Including Feature Layer: NGS Survey Control Monuments. Open data. This data contains a set of geodetic control stations maintained by the National Geodetic Survey. Each geodetic control station in this dataset has either a precise Latitude/Longitude used for horizontal control or a precise Orthometric Height used for vertical control, or both. The National Geodetic Survey (NGS) serves as the Nation's depository for geodetic data. The NGS distributes geodetic data worldwide to a variety of users. These geodetic data include the final results of geodetic surveys, software programs to format, compute, verify, and adjust original survey observations or to convert values from one geodetic datum to another, and publications that describe how to obtain and use Geodetic Data products and services.

Data created by the National Geodetic Survey are survey markers, also called survey marks, survey monuments, survey benchmarks or geodetic marks, placed to mark key survey points on the Earth's surface.

This map depicts the locations of survey monuments within and surrounding the City of Salinas, Monterey County, California. Included are National Geodetic Survey (NGS) and city maintained monuments datasets. See NGS website for additional details on NGS monuments. This is not a comprehensive dataset for all survey monuments within the city, additional sources of monuments may be present within the city. City maintained monuments may not be included in the NGS dataset. This service was created by a member of the GIS team in 2017.

This data contains a set of geodetic control stations maintained by the National Geodetic Survey. Each geodetic control station in this dataset has either a precise Latitude/Longitude used for horizontal control or a precise Orthometric Height used for vertical control, or both.

The National Geodetic Survey (NGS) serves as the Nation's depository for geodetic data. The NGS distributes geodetic data worldwide to a variety of users. These geodetic data include the final results of geodetic surveys, software programs to format, compute, verify, and adjust original survey observations or to convert values from one geodetic datum to another, and publications that describe how to obtain and use Geodetic Data products and services.

This data contains a set of geodetic control stations maintained by the National Geodetic Survey. Each geodetic control station in this dataset has either a precise Latitude/Longitude used for horizontal control or a precise Orthometric Height used for vertical control, or both.The National Geodetic Survey (NGS) serves as the Nation's depository for geodetic data. The NGS distributes geodetic data worldwide to a variety of users. These geodetic data include the final results of geodetic surveys, software programs to format, compute, verify, and adjust original survey observations or to convert values from one geodetic datum to another, and publications that describe how to obtain and use Geodetic Data products and services.

This data contains a set of geodetic control stations maintained by the National Geodetic Survey in the state of Rhode Island. Each geodetic control station in this dataset has either a precise Latitude/Longitude used for horizontal control or a precise Orthometric Height used for vertical control, or both.

This dataset represents all geodetic control stations throughout the state of Rhode Island. The National Geodetic Survey (NGS) serves as the Nation's depository for geodetic data. The NGS distributes geodetic data worldwide to a variety of users. These geodetic data include the final results of geodetic surveys, software programs to format, compute, verify, and adjust original survey observations or to convert values from one geodetic datum to another, and publications that describe how to obtain and use Geodetic Data products and services.

Geodetic control monuments GPS'd and inventoried by the Stark County Engineer (SCE). SCE locates these structures to make their locations available to surveyors and the public. Each record includes an attachment that displays attribute data in a report format. The report also includes a picture of the original survey. Geodetic control monuments are permanent structures that provide a reference point to aid surveyors the means to obtain accurate horizontal and vertical measurements. These monuments were established and maintained by the National Geodetic Survey (NGS).

The Geodetic Database contains information on permanent geodetic control marks located in Minnesota or just outside its boundaries. Permanent geodetic control marks are established for the purpose of providing precise horizontal and vertical control positions for the registration of surveying and mapping activities in the local area. Information about the location of an object based on its geodetic location locates that object in a worldwide geographic information system. The marks have unique identification and year established stamped on the monument disk, usually an 89 mm (3.5 inch) diameter brass or aluminum disk. Monuments consist of material (concrete or metal) that is meant to stay in place for 50 to 100 years or more, and have little or no movement due to frost action or activity near the monument. The marks have been established by all levels of government in Minnesota, and they are referenced to the National Geodetic Reference System (NAD 1927, NAD 1983, NGVD 1929, and NAVD 1988). The Federal Government supports monumentation at the state level by providing technical expertise, adjustments of the data, and maintenance of the National Geodetic Reference System through its State Advisor Program.

This is a point data set representing monumented vertical geodetic survey control points (a.k.a. elevation benchmarks) established by the City of Boise. A benchmark is a physical marker, monument, or demarcation established by a surveyor for horizontal and/or vertical measurement control. This data set only contains benchmarks established by the City of Boise that are based on the North American Vertical Datum of 1988 (NAVD 88); benchmarks established under other vertical datums are not included. The elevation values in this data set are based on the vertical control from the National Geodetic Survey (NGS), the U. S. Geological Survey (USGS), and some state owned vertical control. The horizontal location is obtained by Global Positioning System (GPS) data collection of the surveyed benchmark. Attribute data including elevation, is transcribed from surveying field books supplied by Boise City Public Works survey personnel. Data Attributes:MARK TYPE: ALCAP - Aluminum Cap, BRASSCAP - Brass Cap, CHISELSQ - physically carved square, PK - A steel masonry nail manufactured by Parker Kaelon (PK nail), OTHER - Any other survey marker type.LOCATION: Nearest street or cross streets to the benchmark.ELEVATION: The vertical elevation in feet above sea level as established from survey calculations based on the 1988 NAVD Datum.GPS DATE: Date the benchmark was captured by GPS.COMMENTS: Pertinent notes on general description and location of the benchmark.BOOK: The City of Boise Public Works surveying field book number the benchmark was established under.PAGE: The City of Boise Public Works surveying field book page the benchmark was established under.The data set is maintained by the Boise City Public Works GIS staff. The data is updated continuously. It is current to the date it was published.For more information, please visit Ada County Control Information or City of Boise Public Works.

This data contains a set of geodetic control stations maintained by the National Geodetic Survey. Each geodetic control station in this dataset has either a precise Latitude/Longitude used for horizontal control or a precise Orthometric Height used for vertical control, or both. The National Geodetic Survey (NGS) serves as the Nation's depository for geodetic data. The NGS distributes geodetic data worldwide to a variety of users. These geodetic data include the final results of geodetic surveys, software programs to format, compute, verify, and adjust original survey observations or to convert values from one geodetic datum to another, and publications that describe how to obtain and use Geodetic Data products and services.

Images of National Coast & Geodetic Survey (now NOAA's National Geodetic Survey/NGS) tidal benchmarks which have been superseded by new markers or locations. Period of record is 1830-1984. Scanned under the Climate Database Modernization Program.

for the National Geodetic Survey (NGS) GPS on Bench Marks for the Transformation Tool (GPSonBM TT) Campaign that is currently underway and will continue until early 2023. This campaign will provide users the ability to explore the priority list of bench marks and will be regularly updated to provide the best marks to help NGS develop the best transformation tool for converting heights from the current vertical datums to the North American-Pacific Geopotential Datum of 2022 (NAPGD2022) that is planned to be available at the end of 2022. This includes the following vertical datums: the North American Vertical Datum of 1988 (NAVD 88) for the Conterminous US and Alaska; the Puerto Rico Vertical Datum of 2002 (PRVD02) for Puerto Rico; the Virgin Islands Vertical Datum of 2009 (VIVD09) for the US Virgin Islands; the Guam Vertical Datum of 2004 (GUVD04) for Guam; and the Northern Marianas Vertical Datum of 2003 (NMVD03) for the Commonwealth of the Northern Mariana Islands. Note that the current American Samoa Vertical Datum of 2002 (ASVD02) is planned to be deprecated since it is no longer valid due to an earthquake.This Web Map uses the following Feature Service:NGS GPS on Bench Marks Transformation Tool ServiceThe data and information about this project can be found on the NGS GPS on Bench Marks website.NGS GPS on Bench Marks Website

These data were automated to provide an accurate high-resolution historical shoreline of Cedar Keys to St. Marks suitable as a geographic information system (GIS) data layer. These data are derived from shoreline maps that were produced by the NOAA National Ocean Service including its predecessor agencies which were based on an office interpretation of imagery and/or field survey. The NGS a...

Feature Service for the National Geodetic Survey (NGS) GPS on Bench Marks for the Transformation Tool (GPSonBM TT) Campaign that is currently underway and will continue until early 2023. This campaign will provide users the ability to explore the priority list of bench marks and will be regularly updated to provide the best marks to help NGS develop the best transformation tool for converting heights from the current vertical datums to the North American-Pacific Geopotential Datum of 2022 (NAPGD2022) that is planned to be available at the end of 2022. This includes the following vertical datums: the North American Vertical Datum of 1988 (NAVD 88) for the Conterminous US and Alaska; the Puerto Rico Vertical Datum of 2002 (PRVD02) for Puerto Rico; the Virgin Islands Vertical Datum of 2009 (VIVD09) for the US Virgin Islands; the Guam Vertical Datum of 2004 (GUVD04) for Guam; and the Northern Marianas Vertical Datum of 2003 (NMVD03) for the Commonwealth of the Northern Mariana Islands. Note that the current American Samoa Vertical Datum of 2002 (ASVD02) is planned to be deprecated since it is no longer valid due to an earthquake. For more information about vertical datums visit the NGS Vertical Datums web page.This Feature Service provides most of the data for the NGS GPS on Bench Marks Transformation Tool Web MapThis Service is updated regularly to track progress of the GPSonBM TT Campaign.Data for this web map can be found here: NGS GPS on Bench Marks Web Site

This data contains a set of geodetic control stations maintained by the National Geodetic Survey. Each geodetic control station in this dataset has either a precise Latitude/Longitude used for horizontal control or a precise Orthometric Height used for vertical control, or both. The National Geodetic Survey (NGS) serves as the Nation's depository for geodetic data. The NGS distributes geodetic data worldwide to a variety of users. These geodetic data include the final results of geodetic surveys, software programs to format, compute, verify, and adjust original survey observations or to convert values from one geodetic datum to another, and publications that describe how to obtain and use Geodetic Data products and services.

Data collection: GPS measurements were taken at 24 geodetic monuments during September 27-October 2, 2015. The GPS surveys generally followed established guidelines (Zilkoski and others, 1997), except that the data were processed with single-baseline, rather than multi-baseline, software. GPS measurements were recorded at the monuments on at least 2 different days during 1-hour observation periods. Of the 24 geodetic monuments, 7 were network control stations—DUNE, COCH, DEEP, CAHU, PAIN, C101, and G70; GPS measurements were recorded at these seven stations on 3 additional days during 6.5-hour (or longer) observation periods. Data results: Determining the ellipsoid heights of the 24 geodetic monuments in the network involved 2 phases of least-squares adjustments. During the first phase of least-squares adjustments, horizontal coordinates and ellipsoid heights of the seven Coachella Valley network control monuments were determined by processing the GPS measurements taken at these monuments with simultaneous measurements at three continuous Global Positioning System (CGPS) stations (DHLG, PIN1, and WIDC) and by using precise satellite orbital data and accurate coordinates of the CGPS stations provided by the International GPS Service (IGS) and Scripps Orbit and Permanent Array Center (SOPAC), respectively. During the second phase of least-squares adjustments, the 7 network control monuments were fixed at the positions determined during the first phase, and the horizontal coordinates and ellipsoid heights for the other 17 monuments were calculated. The expected uncertainty of the ellipsoid heights was ±20 mm (±0.07 ft) at the 95-percent confidence level, which was determined using the maximum ellipsoid-height difference computed from 95 percent of the repeatedly observed baselines used in the adjustment. Software used for the baseline and least-squares adjustment computations for the 2015 survey was Trimble Business Center 2.81. Zilkoski, D.B., D’Onofrio, J.D., and Frakes, S.J., 1997, Guidelines for establishing GPS-derived ellipsoid heights, (Standards: 2 cm and 5 cm) version 4.3: Silver Spring, Md., National Geodetic Survey, 10 p., 3 appendices.

The Virginia Coast Reserve Long-term Ecological Research project, in association with the Virginia Marine Resources Commission, conducted an intensive GPS survey during February 1992. A second GPS survey was conducted in August 1994 to add supplemental GPS monuments. Most monuments consist of stainless steel pipes driven to refusal and topped with a bolt with a point imprinted on it. Others may consist of existing markers or cultural features. Elevations refer to the monument, not the surrounding ground surface. All data were processed by the VCR/LTER. Several caveats must be applied to use of this survey network: 1. These are preliminary results and are subject to change as the network is revised. 2. This network is designed for research purposes only, the data are not suitable for legal uses of survey data. 3. The network includes several US Government benchmarks, but except for the VCR1 monument recently resurveyed and "fixed" by the National Geodetic Survey (see below), the coordinates for those benchmarks have not been adjusted to agree with blue-book values for those benchmarks. 4. Elevations are based on mean sea-level (NAVD88) for a single point (VCR1). No geoid corrections have been applied to any other point. *** Update: MINOR coordinate shifts resulting from NGS adjustment of the VCR1 monument's estimated lat/lon following the NAD83 (Va) HARN adjustment of 2011 have been calculated (0.017 m S, 0.001 m W), but not otherwise applied to the data. A shapefile of the VCR GPS network based on the original coordinates has also been included.

These data were automated to provide an accurate high-resolution historical shoreline of Saint Marks and Saint Marks Bay, Apalachee Bay, FL suitable as a geographic information system (GIS) data layer. These data are derived from shoreline maps that were produced by the NOAA National Ocean Service including its predecessor agencies which were based on an office interpretation of imagery and/...

These data were automated to provide an accurate high-resolution historical shoreline of St. Marks to Cape San Blas, Florida suitable as a geographic information system (GIS) data layer. These data are derived from shoreline maps that were produced by the NOAA National Ocean Service including its predecessor agencies which were based on an office interpretation of imagery and/or field survey...